Self-adjusting Schmitt trigger

Details Self-adjusting Schmitt trigger Self-adjusting Schmitt trigger

2007-01-23

2007-01-23

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

Reexamination Certificate

active

10815403

ABSTRACT:
A Schmitt trigger includes a PMOS transistor and an NMOS transistor, each having a gate coupled to an output voltage terminal. The Schmitt trigger is configured such that an input voltage that switches on the PMOS transistor determines a low voltage threshold and an input voltage that switches on the NMOS transistor determines a high voltage threshold. By coupling devices such as diodes to either or both of the PMOS and NMOS transistors, a margin between the low voltage threshold and ground and between the high voltage threshold and a supply voltage are maintained as the supply voltage is reduced. In addition, hysteresis is maintained or increased as supply voltage is increased.

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patent: 6700424 (2004-03-01), Feng
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